Augmentations

There are 7 categories of Augmentations in Deus Ex Human Revolution. Unlike Piezochem's "bio-mods", Sarif Industries' "augmentations" are proto-type bio-mods and are viewed by a human body's immune system as foreign matter.

Implant rejection is high. When this occurs, a drug called neuropryzene is administered to sufferers before the onset of infection and death. Adam Jensen (the dude you play in DX3) does not exhibit symptoms of implant rejection.

While augmentations "naturally" activate (based off of story events), they can be unlocked earlier using Praxis Kits. Each kit allots you one Praxis Point for use in unlocking an augmentation or a higher level of proficiency in an augmentation tree.

Additionally, every 5000 points of experience you earn will acclimatize Adam's body to his implants -- this is represented by the game's automatic conversion of that sum of 5000 points into a single Praxis point.